AMP: 511 Location: I-90 and US 212, Big Horn Cty Reassurance shield after the US 212 split. In three miles, at the Garryowen exit, S-451 will exit without shield and follow old US 87 all the way to the Wyoming line. S to S-463, N to I-90 Bus E to S-463, W to I-90 Bus … Continue reading U.S. Route 87, US-212 to S-451